note04-Computer Network

4.WLAN Wireless LAN (wareless local area network)

IEEE802.11 Wireless Ethernet Protocol Standard

Basic Services Collection BSS

Base Station AP

Service Service Collection Identity SSID is the WiFi name

Assigning system DS

Portal Gateway device Access WLAN 802.11

MAC layer using CSMA/CA carrier monitoring collision avoidance, wireless LAN can not use CSMA/CD carrier monitoring collision detection (before sending to detect whether the channel is idle, empty send; side send edge detection, collision is stopped), because the WLAN send the beginning to send out the entire frame data. Only try to avoid collisions.

　　

note04-Computer Network